Linearization method applied to a MEMS microphone system
US11843907B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 3, 2022 |
| Grant date | Dec 12, 2023 |
| Priority date | — |
| Expiry date | Jun 3, 2042 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2410/03
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A microphone includes a MEMS device having an output node for generating an analog voltage in response to an input sound wave or vibration; a source follower having a control node coupled to the output node of the MEMS device, a current path coupled between a first controlled node and a second controlled node, and a bulk node, wherein the first controlled node is configured for providing a microphone output voltage, and wherein the second controlled node is coupled to a reference voltage; a current source coupled to the first controlled node; and a voltage differential between the first controlled node and the bulk node, wherein a nonzero value of the voltage differential is configured such that a first 1% total harmonic distortion (THD) cross-point of the microphone output voltage is greater than a second 1% THD cross-point of the microphone output voltage using a zero value voltage differential.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.